
public class Link {
	Node prev;
	Node next;
	int weight;
	int operate;
	
	// if weight <= 0, it should remove in Node
	final static int DEFAULT_WEIGHT = 10000;
	
	public Link() {
		
	}
	
	public Link(Node prev, Node next, int weight, int operate) {
		this.prev = prev;
		this.next = next;
		this.weight = weight;
		this.operate = operate;
	}
	
	public Link(Node front, Node next) {
		
	}
}
